'Eua is Tonga's oldest island geologically, and its most rugged. Where the rest of Tonga is flat limestone, 'Eua has real hills — forested, cut through with walking tracks, and edged with sea cliffs that drop directly into the ocean on the east coast. It's 35km long and just 8km wide, and sits about 40km southeast of Tongatapu.
'Eua National Park covers much of the island's interior. Trails through the native forest pass lookouts over the east coast cliffs, sinkholes, and cave systems. The forest holds several species of birds endemic to Tonga. The cliff walk offers dramatic views and the sense that very few people come this way — which, compared to Vava'u, is true.
Whale watching is possible from 'Eua from around early June through October — the island's position near deeper water means whales pass close to shore, and sightings from the cliff edge are not unknown.
Getting here is simple: a 30-minute flight from Tongatapu on Lulutai Airlines, or a 2–3 hour ferry ride. Accommodation is basic — a handful of guesthouses and lodges. There's no resort infrastructure, which is the point.